/*
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 * and open the template in the editor.
 */
package com.srcptit.javatrainning.hieptq.b2;

import java.util.Scanner;

/**
 *
 * @author Hiep
 */
public class String5 {
    public static void main(String [] args) throws Exception{
        Scanner sc=new Scanner(System.in);
        String k="";
        while(true){
            try{
                k=sc.nextLine();
                if(k.length()<1) throw new NumberFormatException();
            }catch(NumberFormatException e){
                continue;
            }
            break;
        }
       //return k;
    
    }
}
       

